Dipping process for coating articles.



W. G. SCOTT. DIPPING PROCESS POR COMING ARTICLES. APPLICATION FILED JAN. 4, 1909.

931,503. Patented Aug. 17. 1909.

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UNITED STATES wINrIELD e, SCOTT, OE'CIIICAGO, ILLINOIS,

PATENT OFFICE.

ASSIGNOR To CHICAGO VARNISII COMPANY,

lOF CHICAGO, ILLINQIS, A CORPORATION. l

" DIPPING PROCESS Fon COMING EMICA'IJES.

Specification of Letters Patent. I

Patented Aug.v17', 1909.

Appneatinn'med-'January 4, Iena. serialnae'voer.

To all rwhom'it may concern:f y Be it known that I, WINFIELDrG. Soo'rr, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook -and State of Illinois, have invented certain new and usefulj Improvements in lthe Dip- I ping Process for Coating Articles, of which I do Ydeclare the following to be a full, clear, and exact description, reference being had to the accompanymg drawing,.forming part of this specification.

In coating artlcles byqthe dipping-process,

l it has long been customary to place within.

the ytank containing' the liquid with which the article is to be coated, mechanical agitators designed to maintain a `uniform character in the body of liquid and prevent any of its heavier ingredients from settling. While the mechanical agitators will serve effectively .for a certain class .Of liquids, such as ordinary paints, I have found thatV when dipping articles ina bath of bronze liquid,

' thesurfaces o f the articles will not be uniforrnly coated, but, asgthe articles, after they have been dip ed, are lifted fromI the tank, there is a ten ency ,of the bronze to settle toward the lower portions of the articles and lto leave the upper ortions in great measure uncovered by the` ronze. This is due not only to the greater specific gravity of the vbronze within theliquid, but to the fact thatl bronte powder, when mixed with a liquid, has a remarkable tendency to flow or settle very rapidl v lI, have discovered that by blowing air through the bronze liquid containedwithin -the dipping tank, not only -will a thorough agitation of the liquid be effected,'but the setting of the liquid upon theA surfaces ofthearticles dip edwill be causedlto occur more.

quicklfy so t at a substantially uniform coating o the bronze liquid will remain upon the whole surface of the article after it yhas been `lifted from the bath.

In carryin out my invention, anysuitable is a View in vertical, longitudinal section on line 1-1 of Fig. 3. Fig. 2 is a View in vertical section on line 2-2 of Fig. l1. Fig. 3 is a plan'view of the tank adapted for the practicevof m'y invention.

y The body of the tank A may be formed of wood or may b of galvanized iron or other suitablematerial, and may be, for example, 36' inches high, 8 feet long and 2 feet wide, and in such a tank there would be normally about 30 inches'of depth ofthe bronze liquid.

Alon the bottom of the tank A extend the ailf pipes B that are provided with perforations b, these perforations being arranged at,suitable distances apart-say, about one inch apart-and being preferably about 3/32nds of an inch in diameter. To the end of each of the pipes B is connected, by a coupling Cfa vertical air delivery pipe B that is united, as by a coupling C to an air supply pipe I) that is tted with a suitable control valve Preferably, the free end ofeaen of the pipes B is fitted with a screw plug F so that the pipes can be readily cleaned, in-event they become-more or less clogged. Preferably, the perforations b in .the pipes B are arranged to discharge the .air downward and inwardly, as shown, al-

though this is notI essential, and, by preference also, the air will be introduced under about 50v pounds pressure, if the column of liquid `Wit in the tank is, say, about 30 inches high: `Of course, if the height' of the column ofliquid is increased, then the air pressure should be correspondingly increase I have. found vin practice that when an article, as,for example, al plate or'bar yof metal, is.dipped within the bath into which airis forced under pressure, and is withdrawn therefrom, the bronze liquid willl Set so .rapidly upon the .whole surface of the plate or4 ar, as itfis lifted Ifrom the bath, that the whole surfaoeof the plate or bar will have substantially a uniforln coating ofthe bronze, and' that there will not be that'- Ioo telidency of the bronze to settle toward the bottom of the plate or bar, which would be the;.case if the bronzel liquid were Simply agitatedby meehanicalmeans.

By the term, bronze liquid, .as herein used, I meanany liquid contaming in sus ension a metallic" owde'r.r f

Havingt us described my invention, what I claim as new, and desire to secure by Letr.ters Patent, .y

1. That improvement in the process of dip- I ping articles in a bronze liquld, which oonsists in dipping the article in a. bath of bronze liquid and blowing airvthrough the liquid 5 bath wherein the article is dipped to cause the liquid to more uniformly set when the article'dipped is withdrawn from the bath. 2. That improvement in the process of dipping articles in a bronze liquid', that con` A sists in discharging air under pressure, ad- 10 jacent the bottom of the column of liquid and dipping the articles in the column of liquid While the liquid is subjected to agitation by the air blown therethrough.

WINFIELD G. SCOTT. lVitnesses GEO. P. FISHER, Jr., KATHARINE GERLACH. 

